Category : C Source Code
Archive   : PATCH12.ZIP
Filename : PCH.C

/* $Header: pch.c,v 2.0.1.9 90/07/15 15:27:00 aas $
*
* $Log: pch.c,v $
* Revision 2.0.1.9 90/07/15 15:27:00 aas
* put do_ed_script() back the way it was and slot-in MSDOS popen/pclose
*
* Revision 2.0.1.8 90/05/30 11:30:00 mward
* replace do_ed_script with stub
* modify calls to read, write to detect error on return value of -1
*
* Revision 2.0.1.7 88/06/03 15:13:28 lwall
* patch10: Can now find patches in shar scripts.
* patch10: Hunks that swapped and then swapped back could core dump.
*
* Revision 2.0.1.6 87/06/04 16:18:13 lwall
* pch_swap didn't swap p_bfake and p_efake.
*
* Revision 2.0.1.5 87/01/30 22:47:42 lwall
* Improved responses to mangled patches.
*
* Revision 2.0.1.4 87/01/05 16:59:53 lwall
* New-style context diffs caused double call to free().
*
* Revision 2.0.1.3 86/11/14 10:08:33 lwall
* Fixed problem where a long pattern wouldn't grow the hunk.
* Also restored p_input_line when backtracking so error messages are right.
*
* Revision 2.0.1.2 86/11/03 17:49:52 lwall
* New-style delete triggers spurious assertion error.
*
* Revision 2.0.1.1 86/10/29 15:52:08 lwall
* Could falsely report new-style context diff.
*
* Revision 2.0 86/09/17 15:39:37 lwall
* Baseline for netwide release.
*
*/

#include "EXTERN.h"
#include "common.h"
#include "util.h"
#include "INTERN.h"
#include "pch.h"

/* Patch (diff listing) abstract type. */

static long p_filesize; /* size of the patch file */
static LINENUM p_first; /* 1st line number */
static LINENUM p_newfirst; /* 1st line number of replacement */
static LINENUM p_ptrn_lines; /* # lines in pattern */
static LINENUM p_repl_lines; /* # lines in replacement text */
static LINENUM p_end = -1; /* last line in hunk */
static LINENUM p_max; /* max allowed value of p_end */
static LINENUM p_context = 3; /* # of context lines */
static LINENUM p_input_line = 0; /* current line # from patch file */
static char **p_line = Null(char**); /* the text of the hunk */
static short *p_len = Null(short*); /* length of each line */
static char *p_char = Nullch; /* +, -, and ! */
static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */
static int p_indent; /* indent to patch */
static LINENUM p_base; /* where to intuit this time */
static LINENUM p_bline; /* line # of p_base */
static LINENUM p_start; /* where intuit found a patch */
static LINENUM p_sline; /* and the line number for it */
static LINENUM p_hunk_beg; /* line number of current hunk */
static LINENUM p_efake = -1; /* end of faked up lines--don't free */
static LINENUM p_bfake = -1; /* beg of faked up lines */

/* Prepare to look for the next patch in the patch file. */

void
re_patch()
{
p_first = Nulline;
p_newfirst = Nulline;
p_ptrn_lines = Nulline;
p_repl_lines = Nulline;
p_end = (LINENUM)-1;
p_max = Nulline;
p_indent = 0;
}

/* Open the patch file at the beginning of time. */

void
open_patch_file(filename)
char *filename;
{
if (filename == Nullch || !*filename || strEQ(filename, "-")) {
pfp = fopen(TMPPATNAME, "w");
if (pfp == Nullfp)
fatal2("patch: can't create %s.\n", TMPPATNAME);
while (fgets(buf, sizeof buf, stdin) != Nullch)
fputs(buf, pfp);
Fclose(pfp);
filename = TMPPATNAME;
}
pfp = fopen(filename, "r");
if (pfp == Nullfp)
fatal2("patch file %s not found\n", filename);
Fstat(fileno(pfp), &filestat);
p_filesize = filestat.st_size;
next_intuit_at(0L,1L); /* start at the beginning */
set_hunkmax();
}

/* Make sure our dynamically realloced tables are malloced to begin with. */

void
set_hunkmax()
{
#ifndef lint
if (p_line == Null(char**))
p_line = (char**) malloc((MEM)hunkmax * sizeof(char *));
if (p_len == Null(short*))
p_len = (short*) malloc((MEM)hunkmax * sizeof(short));
#endif
if (p_char == Nullch)
p_char = (char*) malloc((MEM)hunkmax * sizeof(char));
}

/* Enlarge the arrays containing the current hunk of patch. */

void
grow_hunkmax()
{
hunkmax *= 2;
/*
* Note that on most systems, only the p_line array ever gets fresh memory
* since p_len can move into p_line's old space, and p_char can move into
* p_len's old space. Not on PDP-11's however. But it doesn't matter.
*/
assert(p_line != Null(char**) && p_len != Null(short*) && p_char != Nullch);
#ifndef lint
p_line = (char**) realloc((char*)p_line, (MEM)hunkmax * sizeof(char *));
p_len = (short*) realloc((char*)p_len, (MEM)hunkmax * sizeof(short));
p_char = (char*) realloc((char*)p_char, (MEM)hunkmax * sizeof(char));
#endif
if (p_line != Null(char**) && p_len != Null(short*) && p_char != Nullch)
return;
if (!using_plan_a)
fatal1("patch: out of memory (grow_hunkmax)\n");
out_of_mem = TRUE; /* whatever is null will be allocated again */
/* from within plan_a(), of all places */
}

/* True if the remainder of the patch file contains a diff of some sort. */

bool
there_is_another_patch()
{
if (p_base != 0L && p_base >= p_filesize) {
if (verbose)
say1("done\n");
return FALSE;
}
if (verbose)
say1("Hmm...");
diff_type = intuit_diff_type();
if (!diff_type) {
if (p_base != 0L) {
if (verbose)
say1(" Ignoring the trailing garbage.\ndone\n");
}
else
say1(" I can't seem to find a patch in there anywhere.\n");
return FALSE;
}
if (verbose)
say3(" %sooks like %s to me...\n",
(p_base == 0L ? "L" : "The next patch l"),
diff_type == CONTEXT_DIFF ? "a context diff" :
diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" :
diff_type == NORMAL_DIFF ? "a normal diff" :
"an ed script" );
if (p_indent && verbose)
say3("(Patch is indented %d space%s.)\n", p_indent, p_indent==1?"":"s");
skip_to(p_start,p_sline);
while (filearg[0] == Nullch) {
if (force) {
say1("No file to patch. Skipping...\n");
filearg[0] = savestr(bestguess);
return TRUE;
}
ask1("File to patch: ");
if (*buf != '\n') {
if (bestguess)
free(bestguess);
bestguess = savestr(buf);
filearg[0] = fetchname(buf, 0, FALSE);
}
if (filearg[0] == Nullch) {
ask1("No file found--skip this patch? [n] ");
if (*buf != 'y') {
continue;
}
if (verbose)
say1("Skipping patch...\n");
filearg[0] = fetchname(bestguess, 0, TRUE);
skip_rest_of_patch = TRUE;
return TRUE;
}
}
return TRUE;
}

/* Determine what kind of diff is in the remaining part of the patch file. */

int
intuit_diff_type()
{
Reg4 long this_line = 0;
Reg5 long previous_line;
Reg6 long first_command_line = -1;
long fcl_line;
Reg7 bool last_line_was_command = FALSE;
Reg8 bool this_is_a_command = FALSE;
Reg9 bool stars_last_line = FALSE;
Reg10 bool stars_this_line = FALSE;
Reg3 int indent;
Reg1 char *s;
Reg2 char *t;
char *indtmp = Nullch;
char *oldtmp = Nullch;
char *newtmp = Nullch;
char *indname = Nullch;
char *oldname = Nullch;
char *newname = Nullch;
Reg11 int retval;
bool no_filearg = (filearg[0] == Nullch);

ok_to_create_file = FALSE;
Fseek(pfp, p_base, 0);
p_input_line = p_bline - 1;
for (;;) {
previous_line = this_line;
last_line_was_command = this_is_a_command;
stars_last_line = stars_this_line;
this_line = ftell(pfp);
indent = 0;
p_input_line++;
if (fgets(buf, sizeof buf, pfp) == Nullch) {
if (first_command_line >= 0L) {
/* nothing but deletes!? */
p_start = first_command_line;
p_sline = fcl_line;
retval = ED_DIFF;
goto scan_exit;
}
else {
p_start = this_line;
p_sline = p_input_line;
retval = 0;
goto scan_exit;
}
}
for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) {
if (*s == '\t')
indent += 8 - (indent % 8);
else
indent++;
}
for (t=s; isdigit(*t) || *t == ','; t++) ;
this_is_a_command = (isdigit(*s) &&
(*t == 'd' || *t == 'c' || *t == 'a') );
if (first_command_line < 0L && this_is_a_command) {
first_command_line = this_line;
fcl_line = p_input_line;
p_indent = indent; /* assume this for now */
}
if (!stars_last_line && strnEQ(s, "*** ", 4))
oldtmp = savestr(s+4);
else if (strnEQ(s, "--- ", 4))
newtmp = savestr(s+4);
else if (strnEQ(s, "Index:", 6))
indtmp = savestr(s+6);
else if (strnEQ(s, "Prereq:", 7)) {
for (t=s+7; isspace(*t); t++) ;
revision = savestr(t);
for (t=revision; *t && !isspace(*t); t++) ;
*t = '\0';
if (!*revision) {
free(revision);
revision = Nullch;
}
}
if ((!diff_type || diff_type == ED_DIFF) &&
first_command_line >= 0L &&
strEQ(s, ".\n") ) {
p_indent = indent;
p_start = first_command_line;
p_sline = fcl_line;
retval = ED_DIFF;
goto scan_exit;
}
stars_this_line = strnEQ(s, "********", 8);
if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line &&
strnEQ(s, "*** ", 4)) {
if (!atol(s+4))
ok_to_create_file = TRUE;
/* if this is a new context diff the character just before */
/* the newline is a '*'. */
while (*s != '\n')
s++;
p_indent = indent;
p_start = previous_line;
p_sline = p_input_line - 1;
retval = (*(s-1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF);
goto scan_exit;
}
if ((!diff_type || diff_type == NORMAL_DIFF) &&
last_line_was_command &&
(strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2)) ) {
p_start = previous_line;
p_sline = p_input_line - 1;
p_indent = indent;
retval = NORMAL_DIFF;
goto scan_exit;
}
}
scan_exit:
if (no_filearg) {
if (indtmp != Nullch)
indname = fetchname(indtmp, strippath, ok_to_create_file);
if (oldtmp != Nullch)
oldname = fetchname(oldtmp, strippath, ok_to_create_file);
if (newtmp != Nullch)
newname = fetchname(newtmp, strippath, ok_to_create_file);
if (oldname && newname) {
if (strlen(oldname) < strlen(newname))
filearg[0] = savestr(oldname);
else
filearg[0] = savestr(newname);
}
else if (oldname)
filearg[0] = savestr(oldname);
else if (newname)
filearg[0] = savestr(newname);
else if (indname)
filearg[0] = savestr(indname);
}
if (bestguess) {
free(bestguess);
bestguess = Nullch;
}
if (filearg[0] != Nullch)
bestguess = savestr(filearg[0]);
else if (indtmp != Nullch)
bestguess = fetchname(indtmp, strippath, TRUE);
else {
if (oldtmp != Nullch)
oldname = fetchname(oldtmp, strippath, TRUE);
if (newtmp != Nullch)
newname = fetchname(newtmp, strippath, TRUE);
if (oldname && newname) {
if (strlen(oldname) < strlen(newname))
bestguess = savestr(oldname);
else
bestguess = savestr(newname);
}
else if (oldname)
bestguess = savestr(oldname);
else if (newname)
bestguess = savestr(newname);
}
if (indtmp != Nullch)
free(indtmp);
if (oldtmp != Nullch)
free(oldtmp);
if (newtmp != Nullch)
free(newtmp);
if (indname != Nullch)
free(indname);
if (oldname != Nullch)
free(oldname);
if (newname != Nullch)
free(newname);
return retval;
}

/* Remember where this patch ends so we know where to start up again. */

void
next_intuit_at(file_pos,file_line)
long file_pos;
long file_line;
{
p_base = file_pos;
p_bline = file_line;
}

/* Basically a verbose fseek() to the actual diff listing. */

void
skip_to(file_pos,file_line)
long file_pos;
long file_line;
{
char *ret;

assert(p_base <= file_pos);
if (verbose && p_base < file_pos) {
Fseek(pfp, p_base, 0);
say1("The text leading up to this was:\n--------------------------\n");
while (ftell(pfp) < file_pos) {
ret = fgets(buf, sizeof buf, pfp);
assert(ret != Nullch);
say2("|%s", buf);
}
say1("--------------------------\n");
}
else
Fseek(pfp, file_pos, 0);
p_input_line = file_line - 1;
}

/* True if there is more of the current diff listing to process. */

bool
another_hunk()
{
Reg1 char *s;
Reg8 char *ret;
Reg2 int context = 0;

while (p_end >= 0) {
if (p_end == p_efake)
p_end = p_bfake; /* don't free twice */
else
free(p_line[p_end]);
p_end--;
}
assert(p_end == -1);
p_efake = -1;

p_max = hunkmax; /* gets reduced when --- found */
if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) {
long line_beginning = ftell(pfp);
/* file pos of the current line */
LINENUM repl_beginning = 0; /* index of --- line */
Reg4 LINENUM fillcnt = 0; /* #lines of missing ptrn or repl */
Reg5 LINENUM fillsrc; /* index of first line to copy */
Reg6 LINENUM filldst; /* index of first missing line */
bool ptrn_spaces_eaten = FALSE; /* ptrn was slightly misformed */
Reg9 bool repl_could_be_missing = TRUE;
/* no + or ! lines in this hunk */
bool repl_missing = FALSE; /* we are now backtracking */
long repl_backtrack_position = 0;
/* file pos of first repl line */
LINENUM repl_patch_line; /* input line number for same */
Reg7 LINENUM ptrn_copiable = 0;
/* # of copiable lines in ptrn */

ret = pgets(buf, sizeof buf, pfp);
p_input_line++;
if (ret == Nullch || strnNE(buf, "********", 8)) {
next_intuit_at(line_beginning,p_input_line);
return FALSE;
}
p_context = 100;
p_hunk_beg = p_input_line + 1;
while (p_end < p_max) {
line_beginning = ftell(pfp);
ret = pgets(buf, sizeof buf, pfp);
p_input_line++;
if (ret == Nullch) {
if (p_max - p_end < 4)
Strcpy(buf, " \n"); /* assume blank lines got chopped */
else {
if (repl_beginning && repl_could_be_missing) {
repl_missing = TRUE;
goto hunk_done;
}
fatal1("Unexpected end of file in patch.\n");
}
}
p_end++;
assert(p_end < hunkmax);
p_char[p_end] = *buf;
#ifdef zilog
p_line[(short)p_end] = Nullch;
#else
p_line[p_end] = Nullch;
#endif
switch (*buf) {
case '*':
if (strnEQ(buf, "********", 8)) {
if (repl_beginning && repl_could_be_missing) {
repl_missing = TRUE;
goto hunk_done;
}
else
fatal2("Unexpected end of hunk at line %ld.\n",
p_input_line);
}
if (p_end != 0) {
if (repl_beginning && repl_could_be_missing) {
repl_missing = TRUE;
goto hunk_done;
}
fatal3("Unexpected *** at line %ld: %s", p_input_line, buf);
}
context = 0;
p_line[p_end] = savestr(buf);
if (out_of_mem) {
p_end--;
return FALSE;
}
for (s=buf; *s && !isdigit(*s); s++) ;
if (!*s)
goto malformed;
if (strnEQ(s,"0,0",3))
strcpy(s,s+2);
p_first = (LINENUM) atol(s);
while (isdigit(*s)) s++;
if (*s == ',') {
for (; *s && !isdigit(*s); s++) ;
if (!*s)
goto malformed;
p_ptrn_lines = ((LINENUM)atol(s)) - p_first + 1;
}
else if (p_first)
p_ptrn_lines = 1;
else {
p_ptrn_lines = 0;
p_first = 1;

}
p_max = p_ptrn_lines + 6; /* we need this much at least */
while (p_max >= hunkmax)
grow_hunkmax();
p_max = hunkmax;
break;
case '-':
if (buf[1] == '-') {
if (repl_beginning ||
(p_end != p_ptrn_lines + 1 + (p_char[p_end-1] == '\n')))
{
if (p_end == 1) {
/* `old' lines were omitted - set up to fill */
/* them in from 'new' context lines. */
p_end = p_ptrn_lines + 1;
fillsrc = p_end + 1;
filldst = 1;
fillcnt = p_ptrn_lines;
}
else {
if (repl_beginning) {
if (repl_could_be_missing){
repl_missing = TRUE;
goto hunk_done;
}
fatal3(
"Duplicate \"---\" at line %ld--check line numbers at line %ld.\n",
p_input_line, p_hunk_beg + repl_beginning);
}
else {
fatal4(
"%s \"---\" at line %ld--check line numbers at line %ld.\n",
(p_end <= p_ptrn_lines
? "Premature"
: "Overdue" ),
p_input_line, p_hunk_beg);
}
}
}
repl_beginning = p_end;
repl_backtrack_position = ftell(pfp);
repl_patch_line = p_input_line;
p_line[p_end] = savestr(buf);
if (out_of_mem) {
p_end--;
return FALSE;
}
p_char[p_end] = '=';
for (s=buf; *s && !isdigit(*s); s++) ;
if (!*s)
goto malformed;
p_newfirst = (LINENUM) atol(s);
while (isdigit(*s)) s++;
if (*s == ',') {
for (; *s && !isdigit(*s); s++) ;
if (!*s)
goto malformed;
p_repl_lines = ((LINENUM)atol(s)) - p_newfirst + 1;
}
else if (p_newfirst)
p_repl_lines = 1;
else {
p_repl_lines = 0;
p_newfirst = 1;
}
p_max = p_repl_lines + p_end;
if (p_max > MAXHUNKSIZE)
fatal4("Hunk too large (%ld lines) at line %ld: %s",
p_max, p_input_line, buf);
while (p_max >= hunkmax)
grow_hunkmax();
if (p_repl_lines != ptrn_copiable)
repl_could_be_missing = FALSE;
break;
}
goto change_line;
case '+': case '!':
repl_could_be_missing = FALSE;
change_line:
if (buf[1] == '\n' && canonicalize)
strcpy(buf+1," \n");
if (!isspace(buf[1]) && buf[1] != '>' && buf[1] != '<' &&
repl_beginning && repl_could_be_missing) {
repl_missing = TRUE;
goto hunk_done;
}
if (context > 0) {
if (context < p_context)
p_context = context;
context = -1000;
}
p_line[p_end] = savestr(buf+2);
if (out_of_mem) {
p_end--;
return FALSE;
}
break;
case '\t': case '\n': /* assume the 2 spaces got eaten */
if (repl_beginning && repl_could_be_missing &&
(!ptrn_spaces_eaten || diff_type == NEW_CONTEXT_DIFF) ) {
repl_missing = TRUE;
goto hunk_done;
}
p_line[p_end] = savestr(buf);
if (out_of_mem) {
p_end--;
return FALSE;
}
if (p_end != p_ptrn_lines + 1) {
ptrn_spaces_eaten |= (repl_beginning != 0);
context++;
if (!repl_beginning)
ptrn_copiable++;
p_char[p_end] = ' ';
}
break;
case ' ':
if (!isspace(buf[1]) &&
repl_beginning && repl_could_be_missing) {
repl_missing = TRUE;
goto hunk_done;
}
context++;
if (!repl_beginning)
ptrn_copiable++;
p_line[p_end] = savestr(buf+2);
if (out_of_mem) {
p_end--;
return FALSE;
}
break;
default:
if (repl_beginning && repl_could_be_missing) {
repl_missing = TRUE;
goto hunk_done;
}
goto malformed;
}
/* set up p_len for strncmp() so we don't have to */
/* assume null termination */
if (p_line[p_end])
p_len[p_end] = strlen(p_line[p_end]);
else
p_len[p_end] = 0;
}

hunk_done:
if (p_end >=0 && !repl_beginning)
fatal2("No --- found in patch at line %ld\n", pch_hunk_beg());

if (repl_missing) {

/* reset state back to just after --- */
p_input_line = repl_patch_line;
for (p_end--; p_end > repl_beginning; p_end--)
free(p_line[p_end]);
Fseek(pfp, repl_backtrack_position, 0);

/* redundant 'new' context lines were omitted - set */
/* up to fill them in from the old file context */
fillsrc = 1;
filldst = repl_beginning+1;
fillcnt = p_repl_lines;
p_end = p_max;
}

if (diff_type == CONTEXT_DIFF &&
(fillcnt || (p_first > 1 && ptrn_copiable > 2*p_context)) ) {
if (verbose)
say4("%s\n%s\n%s\n",
"(Fascinating--this is really a new-style context diff but without",
"the telltale extra asterisks on the *** line that usually indicate",
"the new style...)");
diff_type = NEW_CONTEXT_DIFF;
}

/* if there were omitted context lines, fill them in now */
if (fillcnt) {
p_bfake = filldst; /* remember where not to free() */
p_efake = filldst + fillcnt - 1;
while (fillcnt-- > 0) {
while (fillsrc <= p_end && p_char[fillsrc] != ' ')
fillsrc++;
if (fillsrc > p_end)
fatal2("Replacement text or line numbers mangled in hunk at line %ld\n",
p_hunk_beg);
p_line[filldst] = p_line[fillsrc];
p_char[filldst] = p_char[fillsrc];
p_len[filldst] = p_len[fillsrc];
fillsrc++; filldst++;
}
while (fillsrc <= p_end && fillsrc != repl_beginning &&
p_char[fillsrc] != ' ')
fillsrc++;
#ifdef DEBUGGING
if (debug & 64)
printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n",
fillsrc,filldst,repl_beginning,p_end+1);
#endif
assert(fillsrc==p_end+1 || fillsrc==repl_beginning);
assert(filldst==p_end+1 || filldst==repl_beginning);
}
}
else { /* normal diff--fake it up */
char hunk_type;
Reg3 int i;
LINENUM min, max;
long line_beginning = ftell(pfp);

p_context = 0;
ret = pgets(buf, sizeof buf, pfp);
p_input_line++;
if (ret == Nullch || !isdigit(*buf)) {
next_intuit_at(line_beginning,p_input_line);
return FALSE;
}
p_first = (LINENUM)atol(buf);
for (s=buf; isdigit(*s); s++) ;
if (*s == ',') {
p_ptrn_lines = (LINENUM)atol(++s) - p_first + 1;
while (isdigit(*s)) s++;
}
else
p_ptrn_lines = (*s != 'a');
hunk_type = *s;
if (hunk_type == 'a')
p_first++; /* do append rather than insert */
min = (LINENUM)atol(++s);
for (; isdigit(*s); s++) ;
if (*s == ',')
max = (LINENUM)atol(++s);
else
max = min;
if (hunk_type == 'd')
min++;
p_end = p_ptrn_lines + 1 + max - min + 1;
if (p_end > MAXHUNKSIZE)
fatal4("Hunk too large (%ld lines) at line %ld: %s",
p_end, p_input_line, buf);
while (p_end >= hunkmax)
grow_hunkmax();
p_newfirst = min;
p_repl_lines = max - min + 1;
Sprintf(buf, "*** %ld,%ld\n", p_first, p_first + p_ptrn_lines - 1);
p_line[0] = savestr(buf);
if (out_of_mem) {
p_end = -1;
return FALSE;
}
p_char[0] = '*';
for (i=1; i<=p_ptrn_lines; i++) {
ret = pgets(buf, sizeof buf, pfp);
p_input_line++;
if (ret == Nullch)
fatal2("Unexpected end of file in patch at line %ld.\n",
p_input_line);
if (*buf != '<')
fatal2("< expected at line %ld of patch.\n", p_input_line);
p_line[i] = savestr(buf+2);
if (out_of_mem) {
p_end = i-1;
return FALSE;
}
p_len[i] = strlen(p_line[i]);
p_char[i] = '-';
}
if (hunk_type == 'c') {
ret = pgets(buf, sizeof buf, pfp);
p_input_line++;
if (ret == Nullch)
fatal2("Unexpected end of file in patch at line %ld.\n",
p_input_line);
if (*buf != '-')
fatal2("--- expected at line %ld of patch.\n", p_input_line);
}
Sprintf(buf, "--- %ld,%ld\n", min, max);
p_line[i] = savestr(buf);
if (out_of_mem) {
p_end = i-1;
return FALSE;
}
p_char[i] = '=';
for (i++; i<=p_end; i++) {
ret = pgets(buf, sizeof buf, pfp);
p_input_line++;
if (ret == Nullch)
fatal2("Unexpected end of file in patch at line %ld.\n",
p_input_line);
if (*buf != '>')
fatal2("> expected at line %ld of patch.\n", p_input_line);
p_line[i] = savestr(buf+2);
if (out_of_mem) {
p_end = i-1;
return FALSE;
}
p_len[i] = strlen(p_line[i]);
p_char[i] = '+';
}
}
if (reverse) /* backwards patch? */
if (!pch_swap())
say1("Not enough memory to swap next hunk!\n");
#ifdef DEBUGGING
if (debug & 2) {
int i;
char special;

for (i=0; i <= p_end; i++) {
if (i == p_ptrn_lines)
special = '^';
else
special = ' ';
fprintf(stderr, "%3d %c %c %s", i, p_char[i], special, p_line[i]);
Fflush(stderr);
}
}
#endif
if (p_end+1 < hunkmax) /* paranoia reigns supreme... */
p_char[p_end+1] = '^'; /* add a stopper for apply_hunk */
return TRUE;

malformed:
fatal3("Malformed patch at line %ld: %s", p_input_line, buf);
/* about as informative as "Syntax error" in C */
return FALSE; /* for lint */
}

/* Input a line from the patch file, worrying about indentation. */

char *
pgets(bf,sz,fp)
char *bf;
int sz;
FILE *fp;
{
char *ret = fgets(bf, sz, fp);
Reg1 char *s;
Reg2 int indent = 0;

if (p_indent && ret != Nullch) {
for (s=buf;
indent < p_indent && (*s == ' ' || *s == '\t' || *s == 'X'); s++) {
if (*s == '\t')
indent += 8 - (indent % 7);
else
indent++;
}
if (buf != s)
Strcpy(buf, s);
}
return ret;
}

/* Reverse the old and new portions of the current hunk. */

bool
pch_swap()
{
char **tp_line; /* the text of the hunk */
short *tp_len; /* length of each line */
char *tp_char; /* +, -, and ! */
Reg1 LINENUM i;
Reg2 LINENUM n;
bool blankline = FALSE;
Reg3 char *s;

i = p_first;
p_first = p_newfirst;
p_newfirst = i;

/* make a scratch copy */

tp_line = p_line;
tp_len = p_len;
tp_char = p_char;
p_line = Null(char**); /* force set_hunkmax to allocate again */
p_len = Null(short*);
p_char = Nullch;
set_hunkmax();
if (p_line == Null(char**) || p_len == Null(short*) || p_char == Nullch) {
#ifndef lint
if (p_line == Null(char**))
free((char*)p_line);
p_line = tp_line;
if (p_len == Null(short*))
free((char*)p_len);
p_len = tp_len;
#endif
if (p_char == Nullch)
free((char*)p_char);
p_char = tp_char;
return FALSE; /* not enough memory to swap hunk! */
}

/* now turn the new into the old */

i = p_ptrn_lines + 1;
if (tp_char[i] == '\n') { /* account for possible blank line */
blankline = TRUE;
i++;
}
if (p_efake >= 0) { /* fix non-freeable ptr range */
if (p_efake <= i)
n = p_end - i + 1;
else
n = -i;
p_efake += n;
p_bfake += n;
}
for (n=0; i <= p_end; i++,n++) {
p_line[n] = tp_line[i];
p_char[n] = tp_char[i];
if (p_char[n] == '+')
p_char[n] = '-';
p_len[n] = tp_len[i];
}
if (blankline) {
i = p_ptrn_lines + 1;
p_line[n] = tp_line[i];
p_char[n] = tp_char[i];
p_len[n] = tp_len[i];
n++;
}
assert(p_char[0] == '=');
p_char[0] = '*';
for (s=p_line[0]; *s; s++)
if (*s == '-')
*s = '*';

/* now turn the old into the new */

assert(tp_char[0] == '*');
tp_char[0] = '=';
for (s=tp_line[0]; *s; s++)
if (*s == '*')
*s = '-';
for (i=0; n <= p_end; i++,n++) {
p_line[n] = tp_line[i];
p_char[n] = tp_char[i];
if (p_char[n] == '-')
p_char[n] = '+';
p_len[n] = tp_len[i];
}
assert(i == p_ptrn_lines + 1);
i = p_ptrn_lines;
p_ptrn_lines = p_repl_lines;
p_repl_lines = i;
#ifndef lint
if (tp_line == Null(char**))
free((char*)tp_line);
if (tp_len == Null(short*))
free((char*)tp_len);
#endif
if (tp_char == Nullch)
free((char*)tp_char);
return TRUE;
}

/* Return the specified line position in the old file of the old context. */

LINENUM
pch_first()
{
return p_first;
}

/* Return the number of lines of old context. */

LINENUM
pch_ptrn_lines()
{
return p_ptrn_lines;
}

/* Return the probable line position in the new file of the first line. */

LINENUM
pch_newfirst()
{
return p_newfirst;
}

/* Return the number of lines in the replacement text including context. */

LINENUM
pch_repl_lines()
{
return p_repl_lines;
}

/* Return the number of lines in the whole hunk. */

LINENUM
pch_end()
{
return p_end;
}

/* Return the number of context lines before the first changed line. */

LINENUM
pch_context()
{
return p_context;
}

/* Return the length of a particular patch line. */

short
pch_line_len(line)
LINENUM line;
{
return p_len[line];
}

/* Return the control character (+, -, *, !, etc) for a patch line. */

char
pch_char(line)
LINENUM line;
{
return p_char[line];
}

/* Return a pointer to a particular patch line. */

char *
pfetch(line)
LINENUM line;
{
return p_line[line];
}

/* Return where in the patch file this hunk began, for error messages. */

LINENUM
pch_hunk_beg()
{
return p_hunk_beg;
}

/* Apply an ed script by feeding ed itself. */

void
do_ed_script()
{
Reg1 char *t;
Reg2 long beginning_of_this_line;
Reg3 bool this_line_is_command = FALSE;
Reg4 FILE *pipefp;
FILE *popen();

if (!skip_rest_of_patch) {
Unlink(TMPOUTNAME);
copy_file(filearg[0], TMPOUTNAME);
#ifdef TURBOC20
Sprintf(buf, "ed %s", TMPOUTNAME);
#else
if (verbose)
Sprintf(buf, "/bin/ed %s", TMPOUTNAME);
else
Sprintf(buf, "/bin/ed - %s", TMPOUTNAME);
#endif
pipefp = popen(buf, "w");
}
for (;;) {
beginning_of_this_line = ftell(pfp);
if (pgets(buf, sizeof buf, pfp) == Nullch) {
next_intuit_at(beginning_of_this_line,p_input_line);
break;
}
p_input_line++;
for (t=buf; isdigit(*t) || *t == ','; t++) ;
this_line_is_command = (isdigit(*buf) &&
(*t == 'd' || *t == 'c' || *t == 'a') );
if (this_line_is_command) {
if (!skip_rest_of_patch)
fputs(buf, pipefp);
if (*t != 'd') {
while (pgets(buf, sizeof buf, pfp) != Nullch) {
p_input_line++;
if (!skip_rest_of_patch)
fputs(buf, pipefp);
if (strEQ(buf, ".\n"))
break;
}
}
}
else {
next_intuit_at(beginning_of_this_line,p_input_line);
break;
}
}
if (skip_rest_of_patch)
return;
fprintf(pipefp, "w\n");
fprintf(pipefp, "q\n");
Fflush(pipefp);
Pclose(pipefp);
ignore_signals();
if (move_file(TMPOUTNAME, outname) < 0) {
toutkeep = TRUE;
chmod(TMPOUTNAME, filemode);
}
else
chmod(outname, filemode);
set_signals(1);
}